Wang Xuerui, Zhou Tao, Zhang Ping, Yan Wenfu, Li Yongguo, Peng Li, Veerman Dylan, Shi Mengyang, Gu Xuehong, Kapteijn Freek
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing, 211816, P. R. China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Angew Chem Int Ed Engl. 2021 Apr 12;60(16):9032-9037. doi: 10.1002/anie.202100172. Epub 2021 Mar 8.
Capture and storage of the long-lived Kr is an efficient approach to mitigate the emission of volatile radionuclides from the spent nuclear fuel reprocessing facilities. However, it is challenging to separate krypton (Kr) from xenon (Xe) because of the chemical inertness and similar physical properties. Herein we prepared high-silica CHA zeolite membranes with ultra-high selectivity and irradiation stability for Kr/Xe separation. The suitable aperture size and rigid framework endures the membrane a strong size-exclusion effect. The ultrahigh selectivity of 51-152 together with the Kr permeance of 0.7-1.3×10 mol m s Pa of high-silica CHA zeolite membranes far surpass the state-of-the-art polymeric membranes. The membrane is among the most stable polycrystalline membranes for separation of humid Kr/Xe mixtures. Together with the excellent irradiation stability, high-silica CHA zeolite membranes pave the way to separate radioactive Kr from Xe for a notable reduction of the volatile nuclear waste storage volume.
捕获和储存长寿命的氪是减轻乏核燃料后处理设施中挥发性放射性核素排放的有效方法。然而，由于氪（Kr）和氙（Xe）的化学惰性和相似的物理性质，将它们分离具有挑战性。在此，我们制备了具有超高选择性和辐照稳定性的高硅CHA沸石膜用于Kr/Xe分离。合适的孔径尺寸和刚性骨架赋予该膜强大的尺寸排阻效应。高硅CHA沸石膜的51-152的超高选择性以及0.7-1.3×10 mol m s Pa的Kr渗透率远远超过了目前最先进的聚合物膜。该膜是用于分离潮湿Kr/Xe混合物的最稳定的多晶膜之一。连同出色的辐照稳定性，高硅CHA沸石膜为从Xe中分离放射性Kr以显著减少挥发性核废料储存体积铺平了道路。
